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Title:
Narrowband HST imagery of the young planetary nebula Henize 1357
Authors:
Bobrowsky, M.
Affiliation:
AA(CTA Incorp., Rockville, MD, US)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 426, no. 1, p. L47-L50 (ApJL Homepage)
Publication Date:
05/1994
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Astronomical Photography, Astronomical Photometry, Astronomical Spectroscopy, Interstellar Matter, Planetary Nebulae, Spaceborne Astronomy, Stellar Envelopes, Stellar Evolution, Stellar Mass, Stellar Models, Stellar Spectra, Stellar Structure, Visible Spectrum, Cameras, Charge Coupled Devices, Emission Spectra, H Alpha Line, H Beta Line, Hubble Space Telescope, Mathematical Models, Red Giant Stars, Stellar Winds
DOI:
10.1086/187336
Bibliographic Code:
1994ApJ...426L..47B

Abstract

We present Hubble Space Telescope (HST) Planetary Camera observations showing the first optically resolved images of the planetary nebula Henize 1357 . The small size of this object has heretofore precluded optical investigations of its morphology. In H-beta, He 3-1357 appears to have an equatorial ring of enhanced density tilted approximately 56 deg from our line of sight. In addition, there are bubbles of gas above and below the ring with areas of decreased brightness near the poles where a fast stellar wind has broken through the red giant envelope. He 3-1357 has been evolving very rapidly, becoming a planetary nebula only within the past few decades. Assuming a distance of 5.6 kpc, the radius of the nebula is 0.02 pc, implying an expansion age of 2650 yr, although it has been ionized for no more than 40 yr. The H-beta flux is now 5.8 x 10-11 ergs/sq cm/s which implies an ionized mass of 0.2 solar mass, log L*/solar luminosity = 3.7, and a core mass of 0.59 solar mass.

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